HELLO, I AM IN NEED OF THE CORRECT BELT SIZE FOR MY 2072 WITH 50 INCH DECK.MY LOCAL DEALER LOOKS AT ME FUNNY WHEN I ASK FOR THE CORRECT PTO TO MOWER DECK BELT.I HAVE ALREADY GOTTEN 2 AND NEITHER ONE WILL WORK.IF I GET THE RIGHT SIZE I CAN PICK IT UP AT THE LOCAL FARM STORE.THANKS.